Quadropole mass analyzer with linear ion trap

Details Quadropole mass analyzer with linear ion trap Quadropole mass analyzer with linear ion trap

1998-09-17

2000-12-05

Nguyen, Kiet T.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250290, H01J 4942

Patent

active

061570311

ABSTRACT:
The present invention describes a quadrupole mass analyzer with linear ion trap. The quadrupole mass analyzer functions in a dual-mode. A conventional transmission mode operates with external ionizer supplying ions to the quadrupole analyzer. In an ion trap mode, DC endcap electrodes are attached to the rf quadrupole cylinder to form a trapping chamber where ions are confined. The preferred mode is based on a segmented cylinder electrode geometry which produces a substantially quadrupolar field distribution as used in a conventional four-rod quadrupole mass analyzer. Electrodes are generated from a cylinder that has been segmented along its length into some number of electrically isolated electrodes.

REFERENCES:
patent: 3648046 (1972-03-01), Denison et al.
patent: 4985626 (1991-01-01), Margulies
patent: 5401962 (1995-03-01), Ferran

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